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	''For example, if a population consists entirely of players who always defect, except for one who follows the tit-for-tat strategy, '''that''' person is at a slight disadvantage because of the loss on the first turn. In such a population, the optimal strategy is to defect every time.'' ] (]) 04:45, 24 November 2023 (UTC)		''For example, if a population consists entirely of players who always defect, except for one who follows the tit-for-tat strategy, '''that''' person is at a slight disadvantage because of the loss on the first turn. In such a population, the optimal strategy is to defect every time.'' ] (]) 04:45, 24 November 2023 (UTC)

			== Christmas truce in "See also" ==

			No inline citation is given for why the ] is mentioned at ] of this article, and mentioning it in this article seems inappropriate - can anyone explain? As I understand it, the Christmas truce was a ] and therefore should instead be mentioned in that article:

			- if both sides cooperate, everybody involved gets to live that day and enjoy the truce;

			- if both sides betray, then the war continues as usual with some casualties being expected;

			- if one side cooperates with the other betraying, then the cooperating side suffers massive casualties due to an ill-fated attempt to cross ], while the betraying side can shoot the enemy with impunity, but does not enjoy a truce that day. ] (]) 08:53, 7 January 2024 (UTC)

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This article has been mentioned by a media organization:

"New Tack Wins Prisoner's Dilemma". Wired Magazine. October 13, 2004.

Where does "Outcome D" arise from?

Outcome D: If A and B both betray the other, they will share the sentence and serve 5 years

I am failing to see where outcome D comes from? Is it implied in the text?

Premise:

William Poundstone described the game in his 1993 book Prisoner's Dilemma:

   Two members of a criminal gang, A and B, are arrested and imprisoned. Each prisoner is in solitary confinement with no means of communication with their partner. The principal charge would lead to a sentence of ten years in prison; however, the police do not have the evidence for a conviction. They plan to sentence both to two years in prison on a lesser charge but offer each prisoner a Faustian bargain: If one of them confesses to the crime of the principal charge, betraying the other, they will be pardoned and free to leave while the other must serve the entirety of the sentence instead of just two years for the lesser charge.

78.144.219.213 (talk) 12:02, 17 June 2023 (UTC)

I noticed the same when I read it a few days ago but didn't have the time or energy to investigate it or even mention it on the talk page. But I agree completely: There is a non-stated premise that if both are convicted they will share the 10 year sentence in the given hypothetical justice system, and it is confusing that this premise only shows up in Outcome D, out of the blue.

So now I looked further into it, and it turns out that the quote has been messed with. It is not a proper quote from the stated book. The book (William Poundstone: Prisoner's Dilemma, February 1993, ISBN 0-385-41580-X) says this at page 118:

"A typical contemporary version of the story goes like this: Two members of a criminal gang are arrested and imprisoned. Each prisoner is in solitary confinement with no means of speaking to or exchanging messages with the other. The police admit they don't have enough evidence to convict the pair on the principal charge. They plan to sentence both to a year in prison on a lesser charge. Simultaneously, the police offer each prisoner a Faustian bargain. If he testifies against his partner, he will go free while the partner will get three years in prison on the main charge. Oh, yes, there is a catch ... If both prisoners testify against each other, both will be sentenced to two years in jail."

So I guess we should either (1) correct the quote and then also correct the text after the quote to match it, or (2) state our completely own version of the dilemma, without referring to any book, but then I think we could border on something like Misplaced Pages:No original research. I guess option (1) seems to be the most straightforward to ensure we align with reliable sources.

We should also make clear that the quote is just a "typical contemporary version" mentioned in that book, because right now, without reading the article lead, the text can give the impression that this book is the original source of the prisoner's dilemma (even though the book of course makes no such claim; on the contrary, it clearly states the origin as Merrill Flood and Melvin Dresher in 1950, with the name coming from Albert W. Tucker). --Jhertel (talk) 11:43, 18 June 2023 (UTC)

I have adjusted the article now with the correct quote and correction of the actual numbers mentioned in that specific version of the story. I also changed outcomes ABCD to 1234 to lessen confusion with prisoners A and B. Jhertel (talk) 13:33, 18 June 2023 (UTC)

I can't reconcile these 2 statements in the article

I can't reconcile these 2 statements:

"For cooperation to emerge between rational players, the number of rounds must be unknown or infinite."

...

"Another aspect of the iterated prisoner's dilemma is that this tacit agreement between players has always been established successfully even when the number of iterations is made public to both sides."

As an aside, I see the principles discussed as similar to the concept of Metagame / Metagame analysis Mathiastck (talk) 21:37, 20 July 2023 (UTC)

Yeah I think Metagame belongs in a "see also" for Prinsoners Dilemma, it links back here and provides context:

Etymology

The word can be found being used in the context of playing zero-sum games in a publication by the Mental Health Research Institute in 1956. It is alternately claimed that the first known use of the term was in Nigel Howard's book Paradoxes of Rationality: Theory of Metagames and Political Behavior published in 1971, where Howard used the term in his analysis of the Cold War political landscape using a variation of the Prisoner's Dilemma., however Howard used the term in Metagame Analysis in Political Problems published in 1966. In 1967, the word appeared in a study by Russell Lincoln Ackoff and in the Bulletin of the Operations Research Society of America

" Mathiastck (talk) 21:40, 20 July 2023 (UTC)

what?

A purely selfish strategy will not "cheat" on its opponent for purely self-interested reasons first.

Why is that sentence in the "Nice" section? How is a purely selfish strategy "nice?" 107.77.195.33 (talk) 04:39, 24 November 2023 (UTC)

I also don't understand the logic of that sentence. How is a purely selfish strategy not purely selfish? 107.77.195.33 (talk) 04:42, 24 November 2023 (UTC)

what person?

For example, if a population consists entirely of players who always defect, except for one who follows the tit-for-tat strategy, that person is at a slight disadvantage because of the loss on the first turn. In such a population, the optimal strategy is to defect every time. 107.77.195.33 (talk) 04:45, 24 November 2023 (UTC)

Christmas truce in "See also"

No inline citation is given for why the Christmas truce is mentioned at the bottom of this article, and mentioning it in this article seems inappropriate - can anyone explain? As I understand it, the Christmas truce was a stag hunt and therefore should instead be mentioned in that article:

- if both sides cooperate, everybody involved gets to live that day and enjoy the truce;

- if both sides betray, then the war continues as usual with some casualties being expected;

- if one side cooperates with the other betraying, then the cooperating side suffers massive casualties due to an ill-fated attempt to cross no man's land, while the betraying side can shoot the enemy with impunity, but does not enjoy a truce that day. TheDestroyer111 (talk) 08:53, 7 January 2024 (UTC)

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